Unit 7: Invertebrates

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The invertebrates

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Larfe

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Unit 7: Invertebrates


Unit 7: InvertebratesOnline version The invertebrates by Larfe 1 Main difference between vertebrates and invertebrates... a Invertebrates don't have a spine or an articulated internal skeleton b The invertebrates body temperature isn't constant 2 How many main groups of invertebrates are? a 3: Arthropods, Worms and Molluscus b 5: Cnidarians, Arthropods, Worms, Poriferans and Molluscus c 6: Poriferans, Cnidarians, Worms, Molluscs, Arthropods and Echinoderms 3 What is the largest group of invertebrates? a Arthropods b Worms c Poriferans d Cnidarians e Molluscs f Echinoderms 4 What are the characteristics of poriferns? Choose one or more answers a They are animals with a soft and gelationus body and they have radial symmetrey. b They have a cylindrical body with bilateral symmetry c They live fixed to the seabed (immobile), some sponges live in isolation, while others forms colonies, the sponges are sac-shaped and sac shaped and asymmetrical and they don't have tissues or organs. 5 The nutrition of poriferans a They are carnivorous animals. They get oxygen through diffusion. b They feed through filtration. They respire through diffusion. 6 The sensitivity of poriferans a Sponges have a nervous system with a small bulge in the head, which is the brein, and a nerve cord than runs below. b Sponges have a sense organs for smell, thouch and taste. Some have highly developed eyes. c Sponges don't move around. They are extremely simple animals. They don't have a nervous system or sensory organs. 7 The repoduction in poriferans a They can reproduce sexually. b They can reproduce asexually by budding or sexually. c They can reproduce asexually. 8 What are the characteristics of molluscs? a Most are aquatic and the majorit are marine animals, bust some are tererrstial, they have a soft body, the have bilateral symmetry, many are covered with one or two shells and the have a foot, a visceral mass and a mantle. b They live fixed to the seabed (immobile), some sponges live in isolation, while others forms colonies, the sponges are sac-shaped and sac shaped and asymmetrical and they don't have tissues or organs. c d 9 The nutition of molluscs a They have a varied diet. The aqueatic molluscs breathe thoruuch gills and terrestial molluscs breathe through lungsor through tracheae. They have an open ciculatory system. b They have a varied diet. The aqueatic molluscs breathe thoruuch gills and terrestial molluscs breathe through lungs. They have an open ciculatory system. 10 The sensitivity of molluscs a They have a sense organs for smell, thouch and taste. Some have highly developed eyes. b c d 11 The reproduction of molluscs a Sexually and are oviparous. b Asexually by budding. 12 Groups of molluscs a Nematodes, cephalopods and bivalves b Gastrodops, bivalves and cephalopods c Gastrodops, annelids and bivalves 13 What are the characteristics of arthropods? a They have a hard covering. they are divided into the head, thorax and abdomen. Thay have mobile articulated appendages. b Most are aquatic and the majorit are marine animals, bust some are tererrstial, they have a soft body, the have bilateral symmetry, many are covered with one or two shells and the have a foot, a visceral mass and a mantle. c They live fixed to the seabed (immobile), some sponges live in isolation, while others forms colonies, the sponges are sac-shaped and sac shaped and asymmetrical and they don't have tissues or organs. d 14 The nutrition in arthropods a They have a higly varied diet. The aquiatic arthropods breathe through gills. Terrestial arthropods breathe through tracheae or lungs. THey have an op b They have a varied diet. The aquatic molluscs breathe thoruuch gills and terrestial arthropods breathe through lungs. They have an open ciculatory system. 15 The sensitivity in arthoropods a They have a complex nervous system, with a brain, they have well developed sense organs and b They have a nervous system, with a brain, they have well developed sense organs and 16 The reproduction in arthoropods a They reproduce sexually and are oviparous. Larvae harch form the eggs. b Sexually and are oviparous. c Asexually by budding. 17 Groups of arthropods a Arachnids, myriapods and crustaceans b Insects, arachnids, myriapods and crustaceans c Myriapods and crustaceans 18 What are the characteristics of echinoderms? a They are aquatic animals, they don't have a distict head or sense organs and most have radial symmetry. b They are aquatic animals, they don't have a distict head or sense organs and most have bylateral symmetry. c 19 The nutrition in echinoderms a They have a varied diet, they havae a digestive system with a mouth in the lower part and an anus in the upper part and their ambulacral system acts as a circulatory, tespiratory and excretory system. b They have a higly varied diet. The aquiatic arthropods breathe through gills. Terrestial arthropods breathe through tracheae or lungs. THey have an op c d 20 The sensitivity in echinoderms. a They have a higly varied diet. The aquiatic arthropods breathe through gills. Terrestial arthropods breathe through tracheae or lungs. THey have an op b Their nervous system also has radial symmetry. They don't have a brain, their sense organs are not very developed, and they have limited mobility and they use their tube feet to move around. 21 The reproduction in echinoderms a They reproduce sexually with external fertilisation. They are oviparous ad some species are hermaphrodites. Starfis have a great ability to regenerate. They do this by recovering lost fragments. THis ability allows them to reproduce asexually. When a piece breaks off, it forms a new individual. b Sexually and are oviparous. 22 Groups of echinoderms a Starfish, sea urchins, bittle stars and sea cucubers. b Sea urchins, bittle stars and sea cucubers. c Bittle stars and sea cucubers. 23 Worms a They all the same b They are all different but shere some chaacteristicis. Thay have long, soft bodies and don't have articulated limbis for moving around. 24 Groups of worms a Annelids, flatworms and nematodes b Flatworms and nematodes

Unit 7: Invertebrates

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Unit 7: InvertebratesOnline version

by Larfe

Main difference between vertebrates and invertebrates...

How many main groups of invertebrates are?

What is the largest group of invertebrates?

What are the characteristics of poriferns?

The nutrition of poriferans

The sensitivity of poriferans

The repoduction in poriferans

What are the characteristics of molluscs?

The nutition of molluscs

The sensitivity of molluscs

The reproduction of molluscs

Groups of molluscs

What are the characteristics of arthropods?

The nutrition in arthropods

The sensitivity in arthoropods

The reproduction in arthoropods

Groups of arthropods

What are the characteristics of echinoderms?

The nutrition in echinoderms

The sensitivity in echinoderms.

The reproduction in echinoderms

Groups of echinoderms

Worms

Groups of worms